Apes with tools
In July 1960, a 26-year-old Jane Goodall arrived in what is now Gombe Stream National Park. Her mission was to observe the wild chimpanzees (Pan troglodytes schweinfurthii). On November 4, 1960, she witnessed something that would fundamentally alter our understanding of the line between humans and other animals. She saw a chimpanzee she had named David Greybeard strip the leaves from a twig and then use it to "fish" for termites in a mound. Until that moment, science defined humans as "Man the Toolmaker." Goodall's observation proved this was inaccurate. The chimps at Gombe used tools but made them, demonstrating foresight and planning. Subsequent research has documented Gombe chimps using stones to crack nuts and leaves as sponges to soak up water.
The Gombe Stream Research Centre, established in 1965, institutionalized this work. It is now the world's longest-running continuous field study of any wild animal population. Researchers follow the chimpanzees daily, 365 days a year, collecting data on everything from social relationships to genetics. This decades-long project has produced more than 200 scientific papers and has documented the entire lifespans of multiple generations of chimpanzees.
The Four-Year War
Continuous observation at Gombe revealed complex behaviors. It uncovered complex, and sometimes dark, social dynamics. Between 1974 and 1978, researchers witnessed a prolonged and violent conflict within the chimpanzee community. The main study group, known as the Kasekela community, split into two rival factions. A group of six adult males, three females, and their young broke away to form the Kahama community in the southern part of the territory.
What followed was a brutal four-year conflict. Kasekela males formed organized patrols into Kahama territory. The first lethal attack occurred on January 7, 1974, when a party of six Kasekela males ambushed and killed a Kahama male named Godi. Over the next four years, all males of the Kahama community were systematically killed by the Kasekela group. With the Kahama group annihilated, the victorious Kasekela community expanded its territory. The Gombe Chimpanzee War was the first documented instance of long-term, coordinated intergroup violence in non-human primates, showing a capacity for brutality previously thought to be uniquely human.